configure

   1 #!/bin/sh
   2
   3 usage () {
   4 cat <<EOF
   5 Usage: $0 [OPTION]... [VAR=VALUE]... [TARGET]
   6
   7 To assign environment variables (e.g., CC, CFLAGS...), specify them as
   8 VAR=VALUE.  See below for descriptions of some of the useful variables.
   9
  10 Defaults for the options are specified in brackets.
  11
  12 Installation directories:
  13   --prefix=PREFIX         main installation prefix [/usr/local/musl]
  14   --exec-prefix=EPREFIX   installation prefix for executable files [PREFIX]
  15
  16 Fine tuning of the installation directories:
  17   --bindir=DIR            user executables [EPREFIX/bin]
  18   --libdir=DIR            library files for the linker [PREFIX/lib]
  19   --includedir=DIR        include files for the C compiler [PREFIX/include]
  20   --syslibdir=DIR         location for the dynamic linker [/lib]
  21
  22 System types:
  23   --target=TARGET         configure to run on target TARGET [detected]
  24   --host=HOST             same as --target
  25
  26 Optional features:
  27   --enable-optimize=...   optimize listed components for speed over size [auto]
  28   --enable-debug          build with debugging information [disabled]
  29   --enable-warnings       build with recommended warnings flags [disabled]
  30   --enable-visibility     use global visibility options to optimize PIC [auto]
  31   --enable-wrapper=...    build given musl toolchain wrapper [auto]
  32   --disable-shared        inhibit building shared library [enabled]
  33   --disable-static        inhibit building static library [enabled]
  34
  35 Some influential environment variables:
  36   CC                      C compiler command [detected]
  37   CFLAGS                  C compiler flags [-Os -pipe ...]
  38   CROSS_COMPILE           prefix for cross compiler and tools [none]
  39   LIBCC                   compiler runtime library [detected]
  40
  41 Use these variables to override the choices made by configure.
  42
  43 EOF
  44 exit 0
  45 }
  46
  47 # Helper functions
  48
  49 quote () {
  50 tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; }
  51 $1
  52 EOF
  53 printf %s\\n "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#"
  54 }
  55 echo () { printf "%s\n" "$*" ; }
  56 fail () { echo "$*" ; exit 1 ; }
  57 fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; }
  58 cmdexists () { type "$1" >/dev/null 2>&1 ; }
  59 trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; }
  60
  61 stripdir () {
  62 while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done
  63 }
  64
  65 trycppif () {
  66 printf "checking preprocessor condition %s... " "$1"
  67 echo "typedef int x;" > "$tmpc"
  68 echo "#if $1" >> "$tmpc"
  69 echo "#error yes" >> "$tmpc"
  70 echo "#endif" >> "$tmpc"
  71 if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
  72 printf "false\n"
  73 return 1
  74 else
  75 printf "true\n"
  76 return 0
  77 fi
  78 }
  79
  80 tryflag () {
  81 printf "checking whether compiler accepts %s... " "$2"
  82 echo "typedef int x;" > "$tmpc"
  83 if $CC $CFLAGS_TRY $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
  84 printf "yes\n"
  85 eval "$1=\"\${$1} \$2\""
  86 eval "$1=\${$1# }"
  87 return 0
  88 else
  89 printf "no\n"
  90 return 1
  91 fi
  92 }
  93
  94 tryldflag () {
  95 printf "checking whether linker accepts %s... " "$2"
  96 echo "typedef int x;" > "$tmpc"
  97 if $CC $LDFLAGS_TRY -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
  98 printf "yes\n"
  99 eval "$1=\"\${$1} \$2\""
 100 eval "$1=\${$1# }"
 101 return 0
 102 else
 103 printf "no\n"
 104 return 1
 105 fi
 106 }
 107
 108
 109
 110 # Beginning of actual script
 111
 112 CFLAGS_C99FSE=
 113 CFLAGS_AUTO=
 114 CFLAGS_MEMOPS=
 115 CFLAGS_NOSSP=
 116 CFLAGS_TRY=
 117 LDFLAGS_AUTO=
 118 LDFLAGS_TRY=
 119 OPTIMIZE_GLOBS=
 120 prefix=/usr/local/musl
 121 exec_prefix='$(prefix)'
 122 bindir='$(exec_prefix)/bin'
 123 libdir='$(prefix)/lib'
 124 includedir='$(prefix)/include'
 125 syslibdir='/lib'
 126 tools=
 127 tool_libs=
 128 target=
 129 optimize=auto
 130 debug=no
 131 warnings=no
 132 visibility=auto
 133 shared=auto
 134 static=yes
 135 wrapper=auto
 136 gcc_wrapper=no
 137 clang_wrapper=no
 138
 139 for arg ; do
 140 case "$arg" in
 141 --help) usage ;;
 142 --prefix=*) prefix=${arg#*=} ;;
 143 --exec-prefix=*) exec_prefix=${arg#*=} ;;
 144 --bindir=*) bindir=${arg#*=} ;;
 145 --libdir=*) libdir=${arg#*=} ;;
 146 --includedir=*) includedir=${arg#*=} ;;
 147 --syslibdir=*) syslibdir=${arg#*=} ;;
 148 --enable-shared|--enable-shared=yes) shared=yes ;;
 149 --disable-shared|--enable-shared=no) shared=no ;;
 150 --enable-static|--enable-static=yes) static=yes ;;
 151 --disable-static|--enable-static=no) static=no ;;
 152 --enable-optimize) optimize=yes ;;
 153 --enable-optimize=*) optimize=${arg#*=} ;;
 154 --disable-optimize) optimize=no ;;
 155 --enable-debug|--enable-debug=yes) debug=yes ;;
 156 --disable-debug|--enable-debug=no) debug=no ;;
 157 --enable-warnings|--enable-warnings=yes) warnings=yes ;;
 158 --disable-warnings|--enable-warnings=no) warnings=no ;;
 159 --enable-visibility|--enable-visibility=yes) visibility=yes ;;
 160 --disable-visibility|--enable-visibility=no) visibility=no ;;
 161 --enable-wrapper|--enable-wrapper=yes) wrapper=detect ;;
 162 --enable-wrapper=all) wrapper=yes ; gcc_wrapper=yes ; clang_wrapper=yes ;;
 163 --enable-wrapper=gcc) wrapper=yes ; gcc_wrapper=yes ;;
 164 --enable-wrapper=clang) wrapper=yes ; clang_wrapper=yes ;;
 165 --disable-wrapper|--enable-wrapper=no) wrapper=no ;;
 166 --enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ; gcc_wrapper=yes ;;
 167 --disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;;
 168 --enable-*|--disable-*|--with-*|--without-*|--*dir=*|--build=*) ;;
 169 --host=*|--target=*) target=${arg#*=} ;;
 170 -* ) echo "$0: unknown option $arg" ;;
 171 CC=*) CC=${arg#*=} ;;
 172 CFLAGS=*) CFLAGS=${arg#*=} ;;
 173 CPPFLAGS=*) CPPFLAGS=${arg#*=} ;;
 174 LDFLAGS=*) LDFLAGS=${arg#*=} ;;
 175 CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;;
 176 LIBCC=*) LIBCC=${arg#*=} ;;
 177 *=*) ;;
 178 *) target=$arg ;;
 179 esac
 180 done
 181
 182 for i in prefix exec_prefix bindir libdir includedir syslibdir ; do
 183 stripdir $i
 184 done
 185
 186 #
 187 # Get a temp filename we can use
 188 #
 189 i=0
 190 set -C
 191 while : ; do i=$(($i+1))
 192 tmpc="./conf$$-$PPID-$i.c"
 193 2>|/dev/null > "$tmpc" && break
 194 test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc"
 195 done
 196 set +C
 197 trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP
 198
 199 #
 200 # Find a C compiler to use
 201 #
 202 printf "checking for C compiler... "
 203 trycc ${CROSS_COMPILE}gcc
 204 trycc ${CROSS_COMPILE}c99
 205 trycc ${CROSS_COMPILE}cc
 206 printf "%s\n" "$CC"
 207 test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; }
 208
 209 printf "checking whether C compiler works... "
 210 echo "typedef int x;" > "$tmpc"
 211 if output=$($CC $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" 2>&1) ; then
 212 printf "yes\n"
 213 else
 214 printf "no; compiler output follows:\n%s\n" "$output"
 215 exit 1
 216 fi
 217
 218 #
 219 # Figure out options to force errors on unknown flags.
 220 #
 221 tryflag   CFLAGS_TRY  -Werror=unknown-warning-option
 222 tryflag   CFLAGS_TRY  -Werror=unused-command-line-argument
 223 tryldflag LDFLAGS_TRY -Werror=unknown-warning-option
 224 tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument
 225
 226 #
 227 # Need to know if the compiler is gcc or clang to decide which toolchain
 228 # wrappers to build.
 229 #
 230 printf "checking for C compiler family... "
 231 cc_ver="$(LC_ALL=C $CC -v 2>&1)"
 232 cc_family=unknown
 233 if fnmatch '*gcc\ version*' "$cc_ver" ; then
 234 cc_family=gcc
 235 elif fnmatch '*clang\ version*' "$cc_ver" ; then
 236 cc_family=clang
 237 fi
 238 echo "$cc_family"
 239
 240 #
 241 # Figure out toolchain wrapper to build
 242 #
 243 if test "$wrapper" = auto -o "$wrapper" = detect ; then
 244 echo "#include <stdlib.h>" > "$tmpc"
 245 echo "#if ! __GLIBC__" >> "$tmpc"
 246 echo "#error no" >> "$tmpc"
 247 echo "#endif" >> "$tmpc"
 248 printf "checking for toolchain wrapper to build... "
 249 if test "$wrapper" = auto && ! $CC -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 250 echo "none"
 251 elif test "$cc_family" = gcc ; then
 252 gcc_wrapper=yes
 253 echo "gcc"
 254 elif test "$cc_family" = clang ; then
 255 clang_wrapper=yes
 256 echo "clang"
 257 else
 258 echo "none"
 259 if test "$wrapper" = detect ; then
 260 fail "$0: could not find an appropriate toolchain wrapper"
 261 fi
 262 fi
 263 fi
 264
 265 if test "$gcc_wrapper" = yes ; then
 266 tools="$tools tools/musl-gcc"
 267 tool_libs="$tool_libs lib/musl-gcc.specs"
 268 fi
 269 if test "$clang_wrapper" = yes ; then
 270 tools="$tools tools/musl-clang tools/ld.musl-clang"
 271 fi
 272
 273 #
 274 # Find the target architecture
 275 #
 276 printf "checking target system type... "
 277 test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown
 278 printf "%s\n" "$target"
 279
 280 #
 281 # Convert to just ARCH
 282 #
 283 case "$target" in
 284 # Catch these early to simplify matching for 32-bit archs
 285 mips64*|powerpc64*) fail "$0: unsupported target \"$target\"" ;;
 286 arm*) ARCH=arm ;;
 287 aarch64*) ARCH=aarch64 ;;
 288 i?86*) ARCH=i386 ;;
 289 x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;;
 290 x86_64*) ARCH=x86_64 ;;
 291 mips*) ARCH=mips ;;
 292 microblaze*) ARCH=microblaze ;;
 293 or1k*) ARCH=or1k ;;
 294 powerpc*) ARCH=powerpc ;;
 295 sh[1-9bel-]*|sh|superh*) ARCH=sh ;;
 296 unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;;
 297 *) fail "$0: unknown or unsupported target \"$target\"" ;;
 298 esac
 299
 300 #
 301 # Try to get a conforming C99 freestanding environment
 302 #
 303 tryflag CFLAGS_C99FSE -std=c99
 304 tryflag CFLAGS_C99FSE -nostdinc
 305 tryflag CFLAGS_C99FSE -ffreestanding \
 306 || tryflag CFLAGS_C99FSE -fno-builtin
 307 tryflag CFLAGS_C99FSE -fexcess-precision=standard \
 308 || { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; }
 309 tryflag CFLAGS_C99FSE -frounding-math
 310
 311 #
 312 # We may use the may_alias attribute if __GNUC__ is defined, so
 313 # if the compiler defines __GNUC__ but does not provide it,
 314 # it must be defined away as part of the CFLAGS.
 315 #
 316 printf "checking whether compiler needs attribute((may_alias)) suppression... "
 317 cat > "$tmpc" <<EOF
 318 typedef int
 319 #ifdef __GNUC__
 320 __attribute__((__may_alias__))
 321 #endif
 322 x;
 323 EOF
 324 if $CC $CFLAGS_C99FSE -I./arch/$ARCH -I./include $CPPFLAGS $CFLAGS \
 325   -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 326 printf "no\n"
 327 else
 328 printf "yes\n"
 329 CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__="
 330 fi
 331
 332 #
 333 # The GNU toolchain defaults to assuming unmarked files need an
 334 # executable stack, potentially exposing vulnerabilities in programs
 335 # linked with such object files. Fix this.
 336 #
 337 tryflag CFLAGS_C99FSE -Wa,--noexecstack
 338
 339 #
 340 # Check for options to disable stack protector, which needs to be
 341 # disabled for a few early-bootstrap translation units. If not found,
 342 # this is not an error; we assume the toolchain does not do ssp.
 343 #
 344 tryflag CFLAGS_NOSSP -fno-stack-protector
 345
 346 #
 347 # Check for options that may be needed to prevent the compiler from
 348 # generating self-referential versions of memcpy,, memmove, memcmp,
 349 # and memset. Really, we should add a check to determine if this
 350 # option is sufficient, and if not, add a macro to cripple these
 351 # functions with volatile...
 352 #
 353 tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns
 354
 355 #
 356 # Enable debugging if requessted.
 357 #
 358 test "$debug" = yes && CFLAGS_AUTO=-g
 359
 360 #
 361 # Preprocess asm files to add extra debugging information if debug is
 362 # enabled, our assembler supports the needed directives, and the
 363 # preprocessing script has been written for our architecture.
 364 #
 365 printf "checking whether we should preprocess assembly to add debugging information... "
 366 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" &&
 367    test -f "tools/add-cfi.$ARCH.awk" &&
 368    printf ".file 1 \"srcfile.s\"\n.line 1\n.cfi_startproc\n.cfi_endproc" | $CC -g -x assembler -c -o /dev/null 2>/dev/null -
 369 then
 370   ADD_CFI=yes
 371 else
 372   ADD_CFI=no
 373 fi
 374 printf "%s\n" "$ADD_CFI"
 375
 376 #
 377 # Possibly add a -O option to CFLAGS and select modules to optimize with
 378 # -O3 based on the status of --enable-optimize and provided CFLAGS.
 379 #
 380 printf "checking for optimization settings... "
 381 case "x$optimize" in
 382 xauto)
 383 if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then
 384 printf "using provided CFLAGS\n" ;optimize=no
 385 else
 386 printf "using defaults\n" ; optimize=yes
 387 fi
 388 ;;
 389 xsize|xnone) printf "minimize size\n" ; optimize=size ;;
 390 xno|x) printf "disabled\n" ; optimize=no ;;
 391 *) printf "custom\n" ;;
 392 esac
 393
 394 test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
 395 test "$optimize" = yes && optimize="internal,malloc,string"
 396
 397 if fnmatch 'no|size' "$optimize" ; then :
 398 else
 399 printf "components to be optimized for speed:"
 400 while test "$optimize" ; do
 401 case "$optimize" in
 402 *,*) this=${optimize%%,*} optimize=${optimize#*,} ;;
 403 *) this=$optimize optimize=
 404 esac
 405 printf " $this"
 406 case "$this" in
 407 */*.c) ;;
 408 */*) this=$this*.c ;;
 409 *) this=$this/*.c ;;
 410 esac
 411 OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this"
 412 done
 413 OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# }
 414 printf "\n"
 415 fi
 416
 417 # Always try -pipe
 418 tryflag CFLAGS_AUTO -pipe
 419
 420 #
 421 # If debugging is disabled, omit frame pointer. Modern GCC does this
 422 # anyway on most archs even when debugging is enabled since the frame
 423 # pointer is no longer needed for debugging.
 424 #
 425 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then :
 426 else
 427 tryflag CFLAGS_AUTO -fomit-frame-pointer
 428 fi
 429
 430 #
 431 # Modern GCC wants to put DWARF tables (used for debugging and
 432 # unwinding) in the loaded part of the program where they are
 433 # unstrippable. These options force them back to debug sections (and
 434 # cause them not to get generated at all if debugging is off).
 435 #
 436 tryflag CFLAGS_AUTO -fno-unwind-tables
 437 tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
 438
 439 #
 440 # Attempt to put each function and each data object in its own
 441 # section. This both allows additional size optimizations at link
 442 # time and works around a dangerous class of compiler/assembler bugs
 443 # whereby relative address expressions are constant-folded by the
 444 # assembler even when one or more of the symbols involved is
 445 # replaceable. See gas pr 18561 and gcc pr 66609, 68178, etc.
 446 #
 447 tryflag CFLAGS_AUTO -ffunction-sections
 448 tryflag CFLAGS_AUTO -fdata-sections
 449
 450 #
 451 # On x86, make sure we don't have incompatible instruction set
 452 # extensions enabled by default. This is bad for making static binaries.
 453 # We cheat and use i486 rather than i386 because i386 really does not
 454 # work anyway (issues with atomic ops).
 455 # Some build environments pass -march and -mtune options via CC, so
 456 # check both CC and CFLAGS.
 457 #
 458 if test "$ARCH" = "i386" ; then
 459 fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
 460 fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
 461 fi
 462
 463 #
 464 # Even with -std=c99, gcc accepts some constructs which are constraint
 465 # violations. We want to treat these as errors regardless of whether
 466 # other purely stylistic warnings are enabled -- especially implicit
 467 # function declarations, which are a dangerous programming error.
 468 #
 469 tryflag CFLAGS_AUTO -Werror=implicit-function-declaration
 470 tryflag CFLAGS_AUTO -Werror=implicit-int
 471 tryflag CFLAGS_AUTO -Werror=pointer-sign
 472 tryflag CFLAGS_AUTO -Werror=pointer-arith
 473
 474 if test "x$warnings" = xyes ; then
 475 tryflag CFLAGS_AUTO -Wall
 476 tryflag CFLAGS_AUTO -Wno-parentheses
 477 tryflag CFLAGS_AUTO -Wno-uninitialized
 478 tryflag CFLAGS_AUTO -Wno-missing-braces
 479 tryflag CFLAGS_AUTO -Wno-unused-value
 480 tryflag CFLAGS_AUTO -Wno-unused-but-set-variable
 481 tryflag CFLAGS_AUTO -Wno-unknown-pragmas
 482 tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast
 483 fi
 484
 485 if test "x$visibility" = xauto ; then
 486 # This test checks toolchain support for several things:
 487 # - the -include option
 488 # - the attributes/pragmas used in vis.h
 489 # - linking code that takes the address of protected symbols
 490 # - gcc 3.x bug that wrongly claims declarations mismatch
 491 printf "checking whether global visibility preinclude works... "
 492 cat > "$tmpc" <<EOF
 493 __attribute__((__visibility__("default")))
 494 extern struct a *const x;
 495 typedef struct a b;
 496 extern b *const x;
 497 b *const x;
 498 int (*fp)(void);
 499 int foo(void) { }
 500 int bar(void) { fp = foo; return foo(); }
 501 EOF
 502 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
 503   -DSHARED -fPIC -I./src/internal -include vis.h \
 504   -nostdlib -shared -Wl,-Bsymbolic-functions \
 505   -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 506 visibility=yes
 507 else
 508 visibility=no
 509 fi
 510 printf "%s\n" "$visibility"
 511 fi
 512
 513 if test "x$visibility" = xyes ; then
 514 CFLAGS_AUTO="$CFLAGS_AUTO -include vis.h"
 515 CFLAGS_AUTO="${CFLAGS_AUTO# }"
 516 fi
 517
 518 # Reduce space lost to padding for alignment purposes by sorting data
 519 # objects according to their alignment reqirements. This approximates
 520 # optimal packing.
 521 tryldflag LDFLAGS_AUTO -Wl,--sort-section,alignment
 522 tryldflag LDFLAGS_AUTO -Wl,--sort-common
 523
 524 # When linking shared library, drop dummy weak definitions that were
 525 # replaced by strong definitions from other translation units.
 526 tryldflag LDFLAGS_AUTO -Wl,--gc-sections
 527
 528 # Some patched GCC builds have these defaults messed up...
 529 tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
 530
 531 # Prevent linking if there are undefined symbols; if any exist,
 532 # libc.so will crash at runtime during relocation processing.
 533 # The common way this can happen is failure to link the compiler
 534 # runtime library; implementation error is also a possibility.
 535 tryldflag LDFLAGS_AUTO -Wl,--no-undefined
 536
 537 test "$shared" = "no" || {
 538 # Disable dynamic linking if ld is broken and can't do -Bsymbolic-functions
 539 LDFLAGS_DUMMY=
 540 tryldflag LDFLAGS_DUMMY -Wl,-Bsymbolic-functions || {
 541 test "$shared" = "yes" && fail "$0: error: linker cannot build shared library"
 542 printf "warning: disabling dynamic linking support\n"
 543 shared=no
 544 }
 545 }
 546
 547 # Find compiler runtime library
 548 test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
 549 test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
 550 test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \
 551                  && tryldflag LIBCC "$try_libcc"
 552 printf "using compiler runtime libraries: %s\n" "$LIBCC"
 553
 554 # Figure out arch variants for archs with variants
 555 SUBARCH=
 556 t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS"
 557
 558 if test "$ARCH" = "x86_64" ; then
 559 trycppif __ILP32__ "$t" && ARCH=x32
 560 fi
 561
 562 if test "$ARCH" = "arm" ; then
 563 trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb
 564 trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf
 565 fi
 566
 567 if test "$ARCH" = "aarch64" ; then
 568 trycppif __AARCH64EB__ "$t" && SUBARCH=${SUBARCH}_be
 569 fi
 570
 571 if test "$ARCH" = "mips" ; then
 572 trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
 573 trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
 574 fi
 575
 576 test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
 577 && SUBARCH=${SUBARCH}el
 578
 579 if test "$ARCH" = "sh" ; then
 580 tryflag CFLAGS_AUTO -Wa,--isa=any
 581 trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb
 582 if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then
 583 # Some sh configurations are broken and replace double with float
 584 # rather than using softfloat when the fpu is present but only
 585 # supports single precision. Reject them.
 586 printf "checking whether compiler's double type is IEEE double... "
 587 echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc"
 588 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 589 printf "yes\n"
 590 else
 591 printf "no\n"
 592 fail "$0: error: compiler's floating point configuration is unsupported"
 593 fi
 594 else
 595 SUBARCH=${SUBARCH}-nofpu
 596 fi
 597 if trycppif __SH_FDPIC__ "$t" ; then
 598 SUBARCH=${SUBARCH}-fdpic
 599 fi
 600 fi
 601
 602 test "$SUBARCH" \
 603 && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"
 604
 605 case "$ARCH$SUBARCH" in
 606 arm) ASMSUBARCH=el ;;
 607 *) ASMSUBARCH=$SUBARCH ;;
 608 esac
 609
 610 #
 611 # Some archs (powerpc) have different possible long double formats
 612 # that the compiler can be configured for. The logic for whether this
 613 # is supported is in bits/float.h; in general, it is not. We need to
 614 # check for mismatches here or code in printf, strotd, and scanf will
 615 # be dangerously incorrect because it depends on (1) the macros being
 616 # correct, and (2) IEEE semantics.
 617 #
 618 printf "checking whether compiler's long double definition matches float.h... "
 619 echo '#include <float.h>' > "$tmpc"
 620 echo '#if LDBL_MANT_DIG == 53' >> "$tmpc"
 621 echo 'typedef char ldcheck[9-(int)sizeof(long double)];' >> "$tmpc"
 622 echo '#endif' >> "$tmpc"
 623 if $CC $CFLAGS_C99FSE -I./arch/$ARCH -I./include $CPPFLAGS $CFLAGS \
 624   -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 625 printf "yes\n"
 626 else
 627 printf "no\n"
 628 fail "$0: error: unsupported long double type"
 629 fi
 630
 631 printf "creating config.mak... "
 632
 633 cmdline=$(quote "$0")
 634 for i ; do cmdline="$cmdline $(quote "$i")" ; done
 635
 636 exec 3>&1 1>config.mak
 637
 638
 639 cat << EOF
 640 # This version of config.mak was generated by:
 641 # $cmdline
 642 # Any changes made here will be lost if configure is re-run
 643 ARCH = $ARCH
 644 SUBARCH = $SUBARCH
 645 ASMSUBARCH = $ASMSUBARCH
 646 prefix = $prefix
 647 exec_prefix = $exec_prefix
 648 bindir = $bindir
 649 libdir = $libdir
 650 includedir = $includedir
 651 syslibdir = $syslibdir
 652 CC = $CC
 653 CFLAGS = $CFLAGS
 654 CFLAGS_AUTO = $CFLAGS_AUTO
 655 CFLAGS_C99FSE = $CFLAGS_C99FSE
 656 CFLAGS_MEMOPS = $CFLAGS_MEMOPS
 657 CFLAGS_NOSSP = $CFLAGS_NOSSP
 658 CPPFLAGS = $CPPFLAGS
 659 LDFLAGS = $LDFLAGS
 660 LDFLAGS_AUTO = $LDFLAGS_AUTO
 661 CROSS_COMPILE = $CROSS_COMPILE
 662 LIBCC = $LIBCC
 663 OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
 664 ALL_TOOLS = $tools
 665 TOOL_LIBS = $tool_libs
 666 ADD_CFI = $ADD_CFI
 667 EOF
 668 test "x$static" = xno && echo "STATIC_LIBS ="
 669 test "x$shared" = xno && echo "SHARED_LIBS ="
 670 test "x$cc_family" = xgcc && echo 'WRAPCC_GCC = $(CC)'
 671 test "x$cc_family" = xclang && echo 'WRAPCC_CLANG = $(CC)'
 672 exec 1>&3 3>&-
 673
 674 printf "done\n"